The .jumbotron class has default padding assigned to it, this is what’s pushing the image down. You can either override that padding (.jumbotron {padding:0;}) or create a new class with stylings. It looks like you’re trying to use the jumbotron as a card, if you Google around for Bootstap card layout you might find something a bit easier to use, rather than amending a pre-built class.

Also the image will stop busting out if you add a img-responsive class to it